/**
 * Copyright (c) 2005-2009 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 
 * $Id: ReflectionUtils.java 532 2009-10-13 14:50:54Z calvinxiu $
 */
package my.showcase.core.utils;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * 鍙嶅皠鐨刄tils鍑芥暟闆嗗悎.
 * 
 * 鎻愪緵璁块棶绉佹湁鍙橀噺,鑾峰彇娉涘瀷绫诲瀷Class,鎻愬彇闆嗗悎涓厓绱犵殑灞炴�绛塙tils鍑芥暟.
 * 
 * @author calvin
 */
public class ReflectionUtils {

	private static Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);

	/**
	 * 鐩存帴璇诲彇瀵硅薄灞炴�鍊� 鏃犺private/protected淇グ绗� 涓嶇粡杩噂etter鍑芥暟.
	 */
	public static Object getFieldValue(final Object object, final String fieldName) {
		Field field = getDeclaredField(object, fieldName);

		if (field == null)
			throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + object + "]");

		makeAccessible(field);

		Object result = null;
		try {
			result = field.get(object);
		} catch (IllegalAccessException e) {
			logger.error("涓嶅彲鑳芥姏鍑虹殑寮傚父{}", e.getMessage());
		}
		return result;
	}

	/**
	 * 鐩存帴璁剧疆瀵硅薄灞炴�鍊� 鏃犺private/protected淇グ绗� 涓嶇粡杩噑etter鍑芥暟.
	 */
	public static void setFieldValue(final Object object, final String fieldName, final Object value) {
		Field field = getDeclaredField(object, fieldName);

		if (field == null)
			throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + object + "]");

		makeAccessible(field);

		try {
			field.set(object, value);
		} catch (IllegalAccessException e) {
			logger.error("涓嶅彲鑳芥姏鍑虹殑寮傚父:{}", e.getMessage());
		}
	}

	/**
	 * 鐩存帴璋冪敤瀵硅薄鏂规硶, 鏃犺private/protected淇グ绗�
	 */
	public static Object invokeMethod(final Object object, final String methodName, final Class<?>[] parameterTypes,
			final Object[] parameters) {
		Method method = getDeclaredMethod(object, methodName, parameterTypes);
		if (method == null)
			throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + object + "]");

		method.setAccessible(true);

		try {
			return method.invoke(object, parameters);
		} catch (Exception e) {
			throw convertReflectionExceptionToUnchecked(e);
		}
	}

	/**
	 * 寰幆鍚戜笂杞瀷, 鑾峰彇瀵硅薄鐨凞eclaredField.
	 * 
	 * 濡傚悜涓婅浆鍨嬪埌Object浠嶆棤娉曟壘鍒� 杩斿洖null.
	 */
	protected static Field getDeclaredField(final Object object, final String fieldName) {
		Assert.notNull(object, "object涓嶈兘涓虹┖");
		Assert.hasText(fieldName, "fieldName");
		for (Class<?> superClass = object.getClass(); superClass != Object.class; superClass = superClass
				.getSuperclass()) {
			try {
				return superClass.getDeclaredField(fieldName);
			} catch (NoSuchFieldException e) {
				// Field涓嶅湪褰撳墠绫诲畾涔�缁х画鍚戜笂杞瀷
			}
		}
		return null;
	}

	/**
	 * 寮鸿璁剧疆Field鍙闂�
	 */
	protected static void makeAccessible(final Field field) {
		if (!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
			field.setAccessible(true);
		}
	}

	/**
	 * 寰幆鍚戜笂杞瀷,鑾峰彇瀵硅薄鐨凞eclaredMethod.
	 * 
	 * 濡傚悜涓婅浆鍨嬪埌Object浠嶆棤娉曟壘鍒� 杩斿洖null.
	 */
	protected static Method getDeclaredMethod(Object object, String methodName, Class<?>[] parameterTypes) {
		Assert.notNull(object, "object涓嶈兘涓虹┖");

		for (Class<?> superClass = object.getClass(); superClass != Object.class; superClass = superClass
				.getSuperclass()) {
			try {
				return superClass.getDeclaredMethod(methodName, parameterTypes);
			} catch (NoSuchMethodException e) {
				// Method涓嶅湪褰撳墠绫诲畾涔�缁х画鍚戜笂杞瀷
			}
		}
		return null;
	}

	/**
	 * 閫氳繃鍙嶅皠,鑾峰緱Class瀹氫箟涓０鏄庣殑鐖剁被鐨勬硾鍨嬪弬鏁扮殑绫诲瀷.
	 * 濡傛棤娉曟壘鍒� 杩斿洖Object.class.
	 * eg.
	 * public UserDao extends HibernateDao<User>
	 *
	 * @param clazz The class to introspect
	 * @return the first generic declaration, or Object.class if cannot be determined
	 */
	@SuppressWarnings("unchecked")
	public static <T> Class<T> getSuperClassGenricType(final Class clazz) {
		return getSuperClassGenricType(clazz, 0);
	}

	/**
	 * 閫氳繃鍙嶅皠,鑾峰緱瀹氫箟Class鏃跺０鏄庣殑鐖剁被鐨勬硾鍨嬪弬鏁扮殑绫诲瀷.
	 * 濡傛棤娉曟壘鍒� 杩斿洖Object.class.
	 * 
	 * 濡俻ublic UserDao extends HibernateDao<User,Long>
	 *
	 * @param clazz clazz The class to introspect
	 * @param index the Index of the generic ddeclaration,start from 0.
	 * @return the index generic declaration, or Object.class if cannot be determined
	 */
	@SuppressWarnings("unchecked")
	public static Class getSuperClassGenricType(final Class clazz, final int index) {

		Type genType = clazz.getGenericSuperclass();

		if (!(genType instanceof ParameterizedType)) {
			logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
			return Object.class;
		}

		Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

		if (index >= params.length || index < 0) {
			logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
					+ params.length);
			return Object.class;
		}
		if (!(params[index] instanceof Class)) {
			logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
			return Object.class;
		}

		return (Class) params[index];
	}

	/**
	 * 鎻愬彇闆嗗悎涓殑瀵硅薄鐨勫睘鎬�閫氳繃getter鍑芥暟), 缁勫悎鎴怢ist.
	 * 
	 * @param collection 鏉ユ簮闆嗗悎.
	 * @param propertyName 瑕佹彁鍙栫殑灞炴�鍚�
	 */
	@SuppressWarnings("unchecked")
	public static List convertElementPropertyToList(final Collection collection, final String propertyName) {
		List list = new ArrayList();

		try {
			for (Object obj : collection) {
				list.add(PropertyUtils.getProperty(obj, propertyName));
			}
		} catch (Exception e) {
			throw convertReflectionExceptionToUnchecked(e);
		}

		return list;
	}

	/**
	 * 鎻愬彇闆嗗悎涓殑瀵硅薄鐨勫睘鎬�閫氳繃getter鍑芥暟), 缁勫悎鎴愮敱鍒嗗壊绗﹀垎闅旂殑瀛楃涓�
	 * 
	 * @param collection 鏉ユ簮闆嗗悎.
	 * @param propertyName 瑕佹彁鍙栫殑灞炴�鍚�
	 * @param separator 鍒嗛殧绗�
	 */
	@SuppressWarnings("unchecked")
	public static String convertElementPropertyToString(final Collection collection, final String propertyName,
			final String separator) {
		List list = convertElementPropertyToList(collection, propertyName);
		return StringUtils.join(list, separator);
	}

	/**
	 * 杞崲瀛楃涓茬被鍨嬪埌clazz鐨刾roperty绫诲瀷鐨勫�.
	 * 
	 * @param value 寰呰浆鎹㈢殑瀛楃涓�
	 * @param clazz 鎻愪緵绫诲瀷淇℃伅鐨凜lass
	 * @param propertyName 鎻愪緵绫诲瀷淇℃伅鐨凜lass鐨勫睘鎬�
	 */
	public static Object convertValue(Object value, Class<?> toType) {
		try {
			DateConverter dc = new DateConverter();
			dc.setUseLocaleFormat(true);
			dc.setPatterns(new String[] { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss" });
			ConvertUtils.register(dc, Date.class);
			return ConvertUtils.convert(value, toType);
		} catch (Exception e) {
			throw convertReflectionExceptionToUnchecked(e);
		}
	}

	/**
	 * 灏嗗弽灏勬椂鐨刢hecked exception杞崲涓簎nchecked exception.
	 */
	public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
		if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
				|| e instanceof NoSuchMethodException || e instanceof InvocationTargetException)
			return new IllegalArgumentException("Reflection Exception.", e);
		else
			return new RuntimeException(e);
	}
}
